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Divertor particle exhaust and wall inventory on DIII-D

Divertor particle exhaust and wall inventory on DIII-D

Date: September 1, 1995
Creator: Maingi, R.; Jackson, G.L.; Mahdavi, M.A.; Schaffer, M.J.; Wade, M.R.; Mioduszewski, P.K. et al.
Description: Many tokamaks achieve optimum plasma performance by achieving low recycling; various wall conditioning techniques including helium glow discharge cleaning (HeGDC) are routinely applied to help achieve low recycling. Many of these techniques allow strong, transient wall pumping, but they may not be effective for long-pulse tokamaks, such as the International Thermonuclear Experimental Reactor (ITER), the Tokamak Physics Experiment (TPX), Tore Supra Continu, and JT-60SU. Continuous particle exhaust using an in-situ pumping scheme may be effective for wall inventory control in such devices. Recent particle balance experiments on the Tore Supra and DIII-D tokamaks demonstrated that the wall particle inventory could be reduced during a given discharge by use of continuous particle exhaust. In this paper the authors report the first results of wall inventory control and good performance with the in-situ DIII-D cryopump, replacing the HeGDC normally applied between discharges.
Contributing Partner: UNT Libraries Government Documents Department
Divertor plasma physics experiments on the DIII-D tokamak

Divertor plasma physics experiments on the DIII-D tokamak

Date: October 1996
Creator: Mahdavi, M.A.; Allen, S.L. & Evans, T.E.
Description: In this paper we present an overview of the results and conclusions of our most recent divertor physics and development work. Using an array of new divertor diagnostics we have measured the plasma parameters over the entire divertor volume and gained new insights into several divertor physics issues. We present direct experimental evidence for momentum loss along the field lines, large heat convection, and copious volume recombination during detachment. These observations are supported by improved UEDGE modeling incorporating impurity radiation. We have demonstrated divertor exhaust enrichment of neon and argon by action of a forced scrape off layer (SOL) flow and demonstrated divertor pumping as a substitute for conventional wall conditioning. We have observed a divertor radiation zone with a parallel extent that is an order of magnitude larger than that estimated from a 1-D conduction limited model of plasma at coronal equilibrium. Using density profile control by divertor pumping and pellet injection we have attained H-mode confinement at densities above the Greenwald limit. Erosion rates of several candidate ITER plasma facing materials are measured and compared with predictions of a numerical model.
Contributing Partner: UNT Libraries Government Documents Department
Divertor plasma studies on DIII-D: Experiment and modeling

Divertor plasma studies on DIII-D: Experiment and modeling

Date: September 1996
Creator: West, W. P.; Brooks, N. H. & Allen, S. L.
Description: In a magnetically diverted tokamak, the scrape-off layer (SOL) and divertor plasma provides separation between the first wall and the core plasma, intercepting impurities generated at the wall before they reach the core plasma. The divertor plasma can also serve to spread the heat and particle flux over a large area of divertor structure wall using impurity radiation and neutral charge exchange, thus reducing peak heat and particle fluxes at the divertor strike plate. Such a reduction will be required in the next generation of tokamaks, for without it, the divertor engineering requirements are very demanding. To successfully demonstrate a radiative divertor, a highly radiative condition with significant volume recombination must be achieved in the divertor, while maintaining a low impurity content in the core plasma. Divertor plasma properties are determined by a complex interaction of classical parallel transport, anomalous perpendicular transport, impurity transport and radiation, and plasma wall interaction. In this paper the authors describe a set of experiments on DIII-D designed to provide detailed two dimensional documentation of the divertor and SOL plasma. Measurements have been made in operating modes where the plasma is attached to the divertor strike plate and in highly radiating cases where the plasma ...
Contributing Partner: UNT Libraries Government Documents Department
Divertor pumping and other reactor application issues for H-mode

Divertor pumping and other reactor application issues for H-mode

Date: January 1, 1994
Creator: Stambaugh, R.D.; Brooks, N.H. & Allen, S.L.
Description: We summarize results from DIII-D in regard to issues for reactor application of H-mode. Recently, DIII-D has begun to operate a cryopump (D{sub 2} pumping speed = 31,000 {ell}/s at a pressure of 2 mTorr). Initial results are very favorable for density control in H-mode. The plasma density could be reduced by 50%. Energy confinement is unchanged so the temperature rises in proportion to the density drop. Ability to access these less collisional plasmas in H-mode is favorable to current drive application. With the all-graphite wall, impurity accumulation has been eliminated. The exceedingly good confinement of VH-mode offers the possibility of retaining good confinement while radiating copious power from the plasma edge using injected noble gas impurities.
Contributing Partner: UNT Libraries Government Documents Department
Divertor Scenario Development for NSTX Upgrade

Divertor Scenario Development for NSTX Upgrade

Date: November 21, 2012
Creator: Soukhanovskii, V A
Description: Abstract not provided
Contributing Partner: UNT Libraries Government Documents Department
The Divestiture of American Telephone and Telegraph Company: The Impact on Shareholders

The Divestiture of American Telephone and Telegraph Company: The Impact on Shareholders

Date: December 7, 1983
Creator: Gilroy, Angele A
Description: This report analyzes the impact which the divestiture of the American Telephone and Telegraph Company (AT&T) will have on the 3.2 million holders of AT&T stock. The method of distribution and the listing and trading mechanics of the shares as well as dividend and tax information are discussed. A brief analysis of initial stock performance based on the first two weeks of trading concludes the analysis.
Contributing Partner: UNT Libraries Government Documents Department
Divide Cut Drainage Structures Tennessee-Tombigbee Waterway Mississippi and Alabama: Hydraulic Model Investigation

Divide Cut Drainage Structures Tennessee-Tombigbee Waterway Mississippi and Alabama: Hydraulic Model Investigation

Date: October 1976
Creator: Ables, Jackson H., Jr.
Description: Report on model tests related to drainage structures for the Tennessee-Tombigbee Waterway to provide recommendations about construction.
Contributing Partner: UNT Libraries Government Documents Department
A divide-down RF source generation system for the Advanced Photon Source

A divide-down RF source generation system for the Advanced Photon Source

Date: August 1, 1997
Creator: Horan, D.; Lenkszus, F. & Laird, R.
Description: A divide-down rf source system has been designed and built at Argonne National Laboratory to provide harmonically-related and phase-locked rf source signals between the APS 352-MHz storage ring and booster synchrotron rf systems and the 9.77-MHz and 117-MHz positron accumulator ring rf systems. The design provides rapid switching capability back to individual rf synthesizers for each one. The system also contains a digital bucket phase shifter for injection bucket selection. Input 352-MHz rf from a master synthesizer is supplied to a VXI-based ECL divider board which produces 117-MHz and 9.77-MHz square-wave outputs. These outputs are passed through low-pass filters to produce pure signals at the required fundamental frequencies. These signals, plus signals at the same frequencies from independent synthesizers, are fed to an interface chassis where source selection is made via local/remote control of coaxial relays. This chassis also produces buffered outputs at each frequency for monitoring and synchronization of ancillary equipment.
Contributing Partner: UNT Libraries Government Documents Department
Dividend Tax Relief: Effects on Economic Recovery, Long-Term Growth, and the Stock Market

Dividend Tax Relief: Effects on Economic Recovery, Long-Term Growth, and the Stock Market

Date: September 20, 2004
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Dividend Tax Relief: Effects on Economic Recovery, Long-Term Growth, and the Stock Market

Dividend Tax Relief: Effects on Economic Recovery, Long-Term Growth, and the Stock Market

Date: March 28, 2003
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Dividend Tax Relief: Effects on Economic Recovery, Long-Term Growth, and the Stock Market

Dividend Tax Relief: Effects on Economic Recovery, Long-Term Growth, and the Stock Market

Date: April 1, 2008
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Dividends with Demand Response

Dividends with Demand Response

Date: August 1, 2003
Creator: Kintner-Meyer, M.; Goldman, C.; Sezgen, O. & Pratt, D.
Description: No abstract prepared.
Contributing Partner: UNT Libraries Government Documents Department
Dividing wall studies. Progress report, October 1971--December 1971

Dividing wall studies. Progress report, October 1971--December 1971

Date: September 1, 1997
Creator: Crutchmer, J.A.
Description: With the resumption of the Dividing Wall Studies most of this quarter was devoted to preliminary preparations for the proposed series of tests. Two shots involving one-fourth scale untreated walls were fired and analyzed. Four batches of foamed concrete were made and poured into one and one-half inch thick test slabs for future test fires. Seven day and twenty-eight day compression tests were completed on each of the batches. The purpose of this project is to finalize the studies of foamed concrete wall treatment with respect to its effectiveness in reducing wall missile velocities resulting from blast loading conditions.
Contributing Partner: UNT Libraries Government Documents Department
Division of Biological and Medical Research, Annual Report: 1977

Division of Biological and Medical Research, Annual Report: 1977

Date: 1977
Creator: Argonne National Laboratory. Division of Biological and Medical Research.
Description: Annual report on the activities of the division of biological and medical research at Argonne National Laboratory.
Contributing Partner: UNT Libraries Government Documents Department
Division of Biological and Medical Research Annual Report 1980

Division of Biological and Medical Research Annual Report 1980

Date: August 1981
Creator: Argonne National Laboratory. Division of Biological and Medical Research.
Description: The research during 1980 in the Division of Biological and Medical Research, Argonne National Laboratory, is summarized. Research related to nuclear energy includes the delineation, in the6 eagle, of the responses to continuous low level Co gamma radiation and the development of cellular indicators of preclinical phases of leukemia; comparison of lifetime effects in mice of low level neutron and Co gamma radiation.
Contributing Partner: UNT Libraries Government Documents Department
Division of Biological and Medical Research Annual Technical Report 1981

Division of Biological and Medical Research Annual Technical Report 1981

Date: June 1982
Creator: Argonne National Laboratory. Division of Biological and Medical Research.
Description: This report summarizes research during 1981 in the Division of Biological and Medical Research, Argonne National Laboratory. Studies in Low Level Radiation include comparison of lifetime effects in mice of low level neutron and gamma irradiation, delineation of the responses of dogs to continuous low level gamma irradiation, elucidation of mechanisms of radiation damage and repair in mammalian cells, and study of the genetic effects of high LET radiations.
Contributing Partner: UNT Libraries Government Documents Department
Division of Biological and Medical Research Annual Technical Report 1982

Division of Biological and Medical Research Annual Technical Report 1982

Date: May 1983
Creator: Argonne National Laboratory. Division of Biological and Medical Research.
Description: Computer graphic representation of the antigen-binding sites of two Bence-Jones proteins (antibody light chain diners), Loc (left) and Mcg (right). The spheres represent individual amino acids. Each binding site is composed of two variable domains and each domain consists of framework segments and the hyper-variable segments which confer the specificity to the antibody molecule.
Contributing Partner: UNT Libraries Government Documents Department
Division of energy biosciences: Annual report and summaries of FY 1995 activities

Division of energy biosciences: Annual report and summaries of FY 1995 activities

Date: April 1996
Creator: unknown
Description: The mission of the Division of Energy Biosciences is to support research that advances the fundamental knowledge necessary for the future development of biotechnologies related to the Department of Energy`s mission. The departmental civilian objectives include effective and efficient energy production, energy conservation, environmental restoration, and waste management. The Energy Biosciences program emphasizes research in the microbiological and plant sciences, as these understudied areas offer numerous scientific opportunities to dramatically influence environmentally sensible energy production and conservation. The research supported is focused on the basic mechanisms affecting plant productivity, conversion of biomass and other organic materials into fuels and chemicals by microbial systems, and the ability of biological systems to replace energy-intensive or pollutant-producing processes. The Division also addresses the increasing number of new opportunities arising at the interface of biology with other basic energy-related sciences such as biosynthesis of novel materials and the influence of soil organisms on geological processes.
Contributing Partner: UNT Libraries Government Documents Department
Division of Energy Biosciences annual report and summaries of FY 1996 activities

Division of Energy Biosciences annual report and summaries of FY 1996 activities

Date: April 1, 1997
Creator: unknown
Description: The mission of the Division of Energy Biosciences is to support research that advances the fundamental knowledge necessary for the future development of biotechnologies related to the Department of Energy`s mission. The departmental civilian objectives include effective and efficient energy production, energy conservation, environmental restoration, and waste management. The Energy Biosciences program emphasizes research in the microbiological and plant sciences, as these understudied areas offer numerous scientific opportunities to dramatically influence environmentally sensible energy production and conservation. The research supported is focused on the basic mechanism affecting plant productivity, conversion of biomass and other organic materials into fuels and chemicals by microbial systems, and the ability of biological systems to replace energy-intensive or pollutant-producing processes. The Division also addresses the increasing number of new opportunities arising at the interface of biology with other basic energy-related sciences such as biosynthesis of novel materials and the influence of soil organisms on geological processes. This report gives summaries on 225 projects on photosynthesis, membrane or ion transport, plant metabolism and biosynthesis, carbohydrate metabolism lipid metabolism, plant growth and development, plant genetic regulation and genetic mechanisms, plant cell wall development, lignin-polysaccharide breakdown, nitrogen fixation and plant-microbial symbiosis, mechanism for plant adaptation, fermentative microbial metabolism, ...
Contributing Partner: UNT Libraries Government Documents Department
Division of load among the wing, fuselage, and tail of aircraft

Division of load among the wing, fuselage, and tail of aircraft

Date: May 29, 1951
Creator: Mayer, John P & Gillis, Clarence L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Division of Reactor Development, Research and Development Programs Quarterly Progress Report: April - June 1964

Division of Reactor Development, Research and Development Programs Quarterly Progress Report: April - June 1964

Date: November 1964
Creator: Pacific Northwest Laboratory
Description: The programs sponsored by the Division of Reactor Development at Hanford include studies on basic properties of fuel materials and fabrication methods, physics, chemical processing of reactor fuels and radioactive waste, material development, irradiation effects on materials, fuel cycle analysis and advanced concepts, instrumentation, and nondestructive testing techniques. The results of these programs are broadly applicable to the Civilian Application Program.
Contributing Partner: UNT Libraries Government Documents Department
DIXI (Dilation x-ray imager) a new/faster gated x-ray imager for the NIF

DIXI (Dilation x-ray imager) a new/faster gated x-ray imager for the NIF

Date: April 30, 2012
Creator: Nagel, S R; Hilsabeck, T J; Bell, P M; Bradley, D K; Ayers, M J; Barrios, M A et al.
Description: Abstract not provided
Contributing Partner: UNT Libraries Government Documents Department
Djehuty: A Code for Modeling Whole Stars in Three Dimensions

Djehuty: A Code for Modeling Whole Stars in Three Dimensions

Date: October 9, 2001
Creator: Turcotte, S.; Bazan, G.; Castor, J.; Cavallo, R.; Cohl, M.; Cook, K. et al.
Description: The DJEHUTY project is an intensive effort at the Lawrence Livermore National Laboratory (LLNL) to produce a general purpose 3-D stellar structure and evolution code to study dynamic processes in whole stars.
Contributing Partner: UNT Libraries Government Documents Department
DKPRO: A radionuclide decay and reprocessing code

DKPRO: A radionuclide decay and reprocessing code

Date: July 14, 1997
Creator: Wootan, D. & Schmittroth, F.A.
Description: The DKPRO code solves the general problem of modeling complex nuclear wastes streams using ORIGEN2 radionuclide production files. There is a continuing need for estimates of Hanford radionuclides. Physical measurements are one basis; calculational estimates, the approach represented here, are another. Given a known nuclear fuel history, it is relatively straightforward to calculate radionuclide inventories with codes such as the widely-used Oak Ridge National Laboratory code ORIGEN2.
Contributing Partner: UNT Libraries Government Documents Department